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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff1dcb499887b10f2cd0dafca38c27e0ddd9cd99721bcc6c09584d674b0ec610' 
  AND token = '3WptQfJHFSd2hpeir/tmDHRi9CelViaFN6momEHSSl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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