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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae361fb2e4d5d38fd3d3c946d5dbac344d4a00b5de759c4b3ccba6212afef2fc' 
  AND token = 'DtA+/9lNPgHArRl8SyvcL9v1r7Abew0nG/RodgGUdWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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