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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84c794a289a396eb8fea20829040a7920178c7763680cf9e297222f44886a3e4' 
  AND token = 'IjlhJB8Fwxj6T23JYpcnzylQhP7PcN8tWDepWlbVr6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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