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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd6e72a4d52b3ec2b4fdd3382f78ddb33d941328a9eef6565c5ce8b32fc9d26d' 
  AND token = 'beye3wyM0xJ7e3dj7DwUQIBuNJ2n3YrGSvjDIw6DGrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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