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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f8e9dc22090412e126f7a16e2ff0775b7f88798b03d11b8c6c4cb9d1963e1bc' 
  AND token = 'UVC3E1t8B4lrelrC4tHlN+R92vtubalQljSy6pkqa24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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