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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c42cb396d2e4337d641e8583b45b8d11675d9481feab2feb593e4097f0d13838' 
  AND token = 'Xuv16J9sFE3V0bOGaLsAlFXjXlFDXtmUmlcB3yk5PH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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