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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a6ed3f59f2fcfc093392a89e7c1d8903d1b882e612a1e340a881011aa95a7e1' 
  AND token = 'HNwEdR5oVjruvJKekM74ImG1WLrGgQGY+sLNDSDmAkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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