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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24a914f0f891de85694f957be3e5fe13f059d6b41dbe01d0c16d9d3d9be885ee' 
  AND token = 't9fr0zc8/g6ayWQbndIcf+hTZaOCmzb5A4r3FpMuDdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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