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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddf9adfb456ae3b888379d91e5311e279b41ab70d2d815f8d3fbcdbb75f8e3ec' 
  AND token = 'O4u0XmiLhky+gK9u17L6OrkpA+mC5/Huf92bE/IgVCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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