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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceea2f0ed02ce03bc9f4a6fd438daec20eefa367f28ed1f68fc85c70a30be24e' 
  AND token = 'b1czZIIh8E2lvM1AIeJ1dAzumeQ9QE9jd+LB7dl3G64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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