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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98948c65f169a286ec69b4da4666ac1fc71db647ece1d337f33f6095e16c1611' 
  AND token = 'zAxH2aDN0HXWO8BIuvrSM3iB7+BbDlmufV7rWuYbpCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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