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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ed617a285747d35f2c8992883c3ce5f30870861ba3485ab09e9107e1a8948f6' 
  AND token = 'Mbb1A6aFs3iMUirqX+afrfcJ7ASj95/AK29W7VOQcTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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