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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f7d48ef5b165633486ba4b567cd65c7aa5b45f1e38eb25357335aa975cd0077' 
  AND token = 'gbRb/LA2ec27ATbHWj63dT34L+Uuskw7kMg6hzfCdk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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