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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '664d19ed63de2df018bf8596428e1ea3d2c196f85ab21a6fbb33d29a7365d279' 
  AND token = '53tkwAJfBbm0lzpQBBxkE7xNGHeQmufxZT9u8jron3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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