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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4da31af0f30c529280370a3f74f936065a990994f423866479360cc9d329f3cd' 
  AND token = 'JOjBhqolg09QVwO4mxoRFXfpGB0RY91GtQpFfrrCnqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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