SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '969a32d5e190d014f0a514d4e636c8000b8e7a48df41c18b946cd8ccaa9bb9be' 
  AND token = 'WlYs5kmBjJCTtUqO2psrX9igywsZArggyY9vVdmNhXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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