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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '418be402831f0151b28f665e1c1f5e7d0d7e6a5c3486ae2645c548117e4fed89' 
  AND token = 'Iz98ACspq1ofCl8zsE5k/ErEFb+5EFzAuf06C9ebOv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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