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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff06b2ac4320c73cf78bf3ea4f12c284820ba38813c7f6ea699a09da62a4fe72' 
  AND token = '34ZASbYPYApa2ADXsijvXG3WIhsmq4RFBqon/WYfIdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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