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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dec0c1eae5b20f7017dde728a512b52c3348b70f155c3bdb53e45f4547422b16' 
  AND token = 'neBjZAjeF9R3AYgbnSPRytIJMTIMRoGsh5UBGBy0r6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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