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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b18d5e8da9e89c81c0bc6443ea8af23472c688aa9fdc7f5dad7ed59071f03d6f' 
  AND token = 'DwEXI5F7v/knc8MxmlZcgpbxwu1TtugWD8aHb5DnJl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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