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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afe93573aeca596296699e9d4e175466a24e77d001066d16972c1adab682558c' 
  AND token = 'yzWBUZFf1UMgSYJ/LbOF/SXr2zUpOB4iAxziZ0SreAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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