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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a37702922d4cd106e5ebd2a3dc42784a1df5d55e9e1950ac34bd6b4c73de4a0c' 
  AND token = 'bWKbG4sWkXCqXWY1JSg7fcWPKTJPYDYiRagt2sf9EmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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