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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cff1b63f259390e16a3759eeb163bb3d1c872718c04300fb42cfa041c09d572' 
  AND token = 'qKJMWp7yODs/zctkNBrtNyb2LAWU5xfTmK3lAkwxMGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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