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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f334e1036db08f6839bf1858395837e1e38eeaadddd986f172e8f532fa8844ce' 
  AND token = 'pzYAoAXhnty1pc8hTb2lOxofzzggw7cboezNRlbsVNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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