SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67f51a553cce344d427b341ca759c085b653894a1f3c612baad15309eb1da2fe' 
  AND token = 'KECycZZKuEvunhkY69QxppVEYxmAbPKG/323Hlpeq4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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