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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '440da23a7d2b8ec0d53d8133dbcd3367c10774d678901355d1aa38712af13eb9' 
  AND token = 'WTf9DIXb+ssPROELOlaF4paogk7WhhsI00ZlRNkLupI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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