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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d8b744d39e5cce3de8fdf38749ba0cea9a21d3ceb3309a92c92be6732624e8d' 
  AND token = 'k3nz5S0dW7XN/RYMgx0BQwVgRCOl2bXAqVSaLQ9RHXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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