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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13f647dbb54fce76a242a854e5dc96b0581fd5c0eead7149bbba1d694c91591d' 
  AND token = 'id8umaRDmqx+4QuKNNXaIjBqND/FsjcsXw722xTYoK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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