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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e831cc0ef16d8ff355e61530bd48a62ba2fca00c5fcffd192cbda9d9e969fa67' 
  AND token = 'jJ56B+yr8KrBZpFISarJzpWZf3XHfx2+v4cE6+GohD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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