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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b915bd1886a80b49e40e1e29cc7755077b5fb0971649e77df88007c4278b1b4f' 
  AND token = 'AyUekEeT9fLQ8u6VHgCLWK0424zAaU8arydSofPUIJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}