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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99851df0dad83af3eb1bc2ac5e89753d1cd965e1b1eb450bc2a5824585135412' 
  AND token = 'rhyL0wOM9mA7vxY6Fa6sRKci/PpDH69sxUVtUbx4bUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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