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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14acdf7b7b31e54d2dc7f737e5e28101443fd8e356eb2c5c6bc4025ca10b2574' 
  AND token = 'a5DjGUtJvLKFIFDgzHbZptCk8aJJrfQmaIiv4ZDSUDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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