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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ea2bf41b44dea6af556e2f59ab40a0b7f36cf9156fce221e74d882902dfe35a' 
  AND token = 'viVud29ajI5dXoThOHlA2v5/ZM1C6DqwtCVCcG475C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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