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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4a4bd6f8a70983a38e8c367150854493a08b91a9125b9cb9675a37a3e64da79' 
  AND token = 'WkfD6dkfazcTk903WOG289IVnbi1W+9gwVO+sEy6IUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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