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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fe4733bea5fd4ea8f7d6d9a59a93f29073c4d3a33e34a6e72e030e9eadb4137' 
  AND token = 'H4mCy5WDaesB+15/u0l1xTijtmtyiJIKNEdwFxbh/MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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