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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f54a2b7fd9c15907ef1659d684289aba5ad73d24f7472852682b98edab0bb55' 
  AND token = 'lIHhW96WO9R/VZk/fzvksBx1zl01bad6OnLduTx/i3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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