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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '367e3956637cd77439198cc43fbbd3cffa78810cf41245d3c7d0fee215fef467' 
  AND token = '8AsLEP0oaaoQ4y4DpDHppl/Dug2a6MUiZghSC6z+/50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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