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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4383481043e2b2d1e523f5714381e212bb1d4c1d473ac5761d67bf7e37bffb7f' 
  AND token = 'YfY5Q0TGFA2hYVot8ja00nNzrNeDhGfY2yKgR1lk4KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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