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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ccacf4a4773d90ec3bcf7477d175a2e2c016b01d91a8faf61b52caa1ca426e2' 
  AND token = 'Zn1P4ZwMATqp3NSFjFkQ61+Q8JQ9+D1kYkCKFGi8n2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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