SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82ad05f73b259a0215c07f5c441b052562e81a665bb1410cc6d8553908fffeba' 
  AND token = 'ztnPJnbuFVj6Sqt1W3AH2DvNeW/C+00H/o+P/IKUJ4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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