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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5662fce158be51f95172beeb78d5c07e828909f4d5f55b4eaa889e21c427645' 
  AND token = 's4gPZy7/NIXAqlZo/x8W7wTsjruhbamfwL9tLQfcJ7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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