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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '171e5ac2f1d6390b22dd65eec1cd2fcf33cb174c027031beb7049abd7b17b3e2' 
  AND token = 'jUa+VArEb0FFHZJFmPEAPKN8VNbZIHq5Y82cvGE8DCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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