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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22f8d8d5acb8065fa39f11033043f1463f1234b0bacbdd9b45838669d7563449' 
  AND token = 'U6KCAts8kunxiIaiyXLg2KAkl+MRGgt2QFPdmCAwwf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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