SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c63aee79f11ad9e9fc31523b5df4585b86ca9f0be1cc1732a78272cf6782da02' 
  AND token = 'tIZtN6gHtC1v4/fn3qEB2FI6Jf2oJ7GZbHPqmGQS1Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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