SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09bed762190d1019164dea04e2d89a9a34c90d874563dcf765074533c3e675dc' 
  AND token = 'H7voy5sIZgsKMtlQcqNgKkgJPOIoPWWbVcW/JGUYCmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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