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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76c7d6246d7bbf330ba04352348a7be6e1185ef3f2151fa080675e43d8154a0d' 
  AND token = 'ea97+7fO96Ka+Raw8w8TYZxUUWO1gw76PvNYA0JEl10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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