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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e44448333175ba7b1c4e4f543461aea47bd03dece93fd8ed289180eba34a74df' 
  AND token = 'ccS9zZGNQf3MpIrhDlqs9CRQuscsmgsom+exj64eIOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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