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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd712eb36a8408f6599505a091a0d4e76d612724a7ff8fb99a1b17e180f68c73e' 
  AND token = 'kARqdtqcrnYXuMWD8J5kWXga0MQjN7Iuji1lS3xPrDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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