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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '048fee67372b50aaa7593e7c0ae12c3f9cbe3b1616be824aa0b62f596c01c868' 
  AND token = 'oDgYKJoHHkT4l1B5S8CzKdlgCuDZEc1qo6MjId149Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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