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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2530406434c37b039b42c24e9d1d044301dcee2e9ee352c53f969cb934f35d56' 
  AND token = '7r/GsoC8L4yPLvVqdlxs3pY274X6d1nEUbZdBfHoSlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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