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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '197ce63257f4351cf4add52ad4fcb2ec517dae2c1e857d57abdbb1b42b0f78e6' 
  AND token = 'wFILm0pHhmO6RZtVFPyJBLRL7xreEO9gxBLOt8VQ5W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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