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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dd93f130472268c979c7cadb046b50c0fb01dd762d09047d221e93439ca0547' 
  AND token = 'CB4iBhGcJ1cxHSYqISQ59eJDxbp08adq9wvvZIxMq4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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