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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b7595ebed9bf4c914d03394176ae0c6a7d8f74f3c397eaa76f45d10ffda8f4b' 
  AND token = 'MQPcM3NHvovrar3A8g7r1tIAMYE9DdkNKGVAxQmZq68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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