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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '473456026061acee9af70fcbf66fc50361b46838239729818c92660310f4cbbe' 
  AND token = '45trFAP3fC1VLgPUEvFG3zmaL7TR/AOqASb/53fg/p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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