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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6959fff59241f6dba1680af77ecf92bfda2fb8755dcf865ac18e19de47ef526' 
  AND token = 'kwyeugaBCr0bYHLs12hd1mN+0vz5BJ8GR8hIU6A+hQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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