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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c72ce6fc27f939bfc924658c84eb9575002dafb685f837b57f6ff2c028c1f67' 
  AND token = 'LAOvf624W2VMvsBMoHSuJgz5wxrV9LOenwnze5uZy5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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