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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ceda0009c0f38f8d15553f94dbfece1d59b033b25fb9de6ce1afffaafdf7f22' 
  AND token = 'J6Vd/ikbxKXG3d2dBRYTvhYr6fBCaG/J4Ru4E5Qp/+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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