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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf126025b982b6b21dfc9c15aa5454d1f6b1c7aa6eb5760242925579f2b11a75' 
  AND token = 'm/20TwLxXMUETVLVrWzJBAQyJ+PJ8957wu4eY8oeXBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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