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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2c231a2b0e64af6618ad24e0e9cc699db6a0b8db728e9bc22fef18b5921de3f' 
  AND token = '5filAw94Gwd5T4I3/bG9F/k2Tliua+c+XSS/UprtW68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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